Tanks for your answer, first i didnt try this both versions, but they aren't working either.

Am i getting this right, because my collegue said at opening the site the list items (parent and child) are fetched without the SpService Javascript. But this cant be true, right? Because then Recursive wouldn't work at opening, either?

When loading the page, in my example some formular which uses spservices CascadeDropdowns, the parent and the child dropdowns are filled with the results from camlquery, not with some sharepoint services themself, right? So i should change the CamlQuery
to get the results i want ( ex. Recursive), and without the folder names in this dropdown menu..

I totally missed that you said SPCascadeDropdowns above; I thought you were working with GetListItems. Can you post back your entire call so that I can see what you are doing?

If you are using SPCascadeDropdowns, then that's a different thing. How that works is that the page loads just as it normally would without the script, and all dropdowns have all available values. Then the script runs and pares down the options based on
the settings you've provided in the function call(s).